Apache JMeter is the most widely used open-source load and performance testing tool. This blog is intended for beginners who would like to learn how to utilize JMeter who are just starting with this powerful tool. (Note: If you're already a JMeter expert, this blog on developing advanced load testing scenarios might be of interest to you). In this blog, we will learn how to install JMeter and prepare test strategies. We'll go over how to create the test plans and their configurations, adding components to the test plan.
You must always utilize the newest version of JMeter, according to the article titled "9 Easy Solutions for a JMeter Load Test "Out of Memory" Failure". Verify the JMeter Release Notes to see which version is the most current and stable.
The following are the steps to take:
Now you have everything you need to get started on your test plan.
Postscript, We suggest that you install Java and JMeter using the approach described above for the following reasons:
JMeter might be available through your Linux distribution package manager. The authenticity of the version, on the other hand, is a significant question mark. For example, JMeter 5.4, which was published at the end of 2020, is currently available in Ubuntu (one of the most widely distributed Linux distributions).
There are certain exceptions that JMeter comes with all the files you need to build and run most tests. For database load testing, for example, you'll need the JDBC driver, and for JMS load testing, you'll need the MQ client libraries.
Become a master of Jmeter by going through this HKR JMeter Online Training
To get JMeter up and running, do the following:
For Mac/Linux/Unix: ./jmeter.sh
For Windows: jmeter.bat
It is suggested that you use the command-line interpreter since you will be able to see the output in the console window when something goes wrong. If JMeter does not start after you double-click the icon of its startup script or the ApacheJMeter.jar file, you will be unaware of the failure reason.
You must now have an empty test plan (as seen in the below picture):
You haven't seen the JMeter graphical user interface yet? Verify that:
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You should provide the overall parameters and the steps you need JMeter to perform when it runs in your test plan. You can also give it a name and leave comments for future reference.
Creating a Complete Test Plan
You have To:
Configure at Least One Thread Group and Sampler
The number of users you would like to simulate is specified in a Thread group. One thread = one user. You could also tell JMeter how long it should take to reach all of the threads you've selected by specifying the ramp-up period. With the Loop Count, you can also specify the number of iterations for each person in the group.
Samplers are critical since they are the ones who do the actual work in JMeter. JMeter runs the samplers and logs the results, including the start time, length, success, response messages, and so on. These results can be viewed using listeners (but more on that later). The HTTP Request sampler is the most often used sampler since it allows you to submit an HTTP or HTTPS request to a web server.
We Suggest That You:
You can specify the duration of the delay between requests here (i.e. how long would you like JMeter to wait before jumping from the home page to the features page?). Real users don't constantly hammer the system under test; they require time to "think" in-between activities, which is why it's critical to precisely imitate this behavior in order to provide a realistic network footprint. For further information, see the article A Comprehensive Guide to JMeter Timers.
Add Configuration Elements
These allow you to control aspects such as the cache and cookies while the test is running. To simulate browser behavior, we recommend installing the "HTTP Cache Manager" and "HTTP Cookie Manager." This article explains how to make JMeter behave like a real browser.
You can use these to define your test's pass or fail criteria. Let's imagine you want your website or app to reply in less than 100 milliseconds. A Duration Assertion could be used to state that any answer that lasts longer than 100 milliseconds will result in the sample being classed as "failed."
The Response Assertion is the most crucial assertion to comprehend. It's no surprise that this covers 99 percent of your requirements. It lets you test the URL, response body, messages, embedded resources, redirects, and headers, among other things. This assertion allows you to test regular expressions rather than text patterns, which provides you a lot of versatility. Regular expressions are handled in JMeter in a similar way to Perl, with the exception that the expression is not enclosed in //'s.
In our blog post, how to use JMeter Assertions in Three Easy Steps, we explain what assertions are, what they do, and how to use them.
FREQUENTLY ASKED JMeter INTERVIEW QUESTIONS
As previously stated, these allow you to view the outcomes of a sampler. You can see them as a table, graph, tree, or log file in a variety of formats. Listeners could be placed anywhere in the test, but they will only collect data from items on the same level or below.
The View Results Tree listener is the most popular since it displays all of the test plans results in a logical tree format. The Assertion Results, Aggregate Report, and Beanshell Listener are among the other listeners.
One thing to keep in mind is that when you perform the load tests, you should disable all of your listeners because they consume a lot of memory. The next blog post in this series will go into the dos and don'ts of running tests in greater depth.
Before you execute the test plan, you can set up and include all of these components. Here's how to do it:
[Related Blog: JMeter Performance Testing]
In this blog, we have successfully learned how to install JMeter as explained with implementation steps. Further, we have discussed how to build the test plan for JMeter using the command line interpreter. We have also learned about creating a complete test plan by implementing a Thread Group and sampler configurations and at last applying the configuration steps for adding components to the test plan.
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